Microsoft has very recently released three fixes for Windows 8.1 Preview.
Update for Windows 8.1 Preview that enables service metadata packages to work correctly-This updates resolves an issue that could cause the service metadata packages of some network operators not to function.
You cannot view a webpage that contains a timer in Internet Explorer 11 Preview-In this scenario, Internet Explorer 11 Preview incorrectly does not start the VBScript code that is associated with the timer. Therefore, the webpage may not appear or behave as expected.
Update that improves the stability of SkyDrive in Windows 8.1 Preview-An update is available for Windows 8.1 Preview that improves the stability of the SkyDrive service.